2x^2+13x+12=10

Solution for 2x^2+13x+12=10 equation:

Simplifying
2x2 + 13x + 12 = 10

Reorder the terms:
12 + 13x + 2x2 = 10

Solving
12 + 13x + 2x2 = 10

Solving for variable 'x'.

Reorder the terms:
12 + -10 + 13x + 2x2 = 10 + -10

Combine like terms: 12 + -10 = 2
2 + 13x + 2x2 = 10 + -10

Combine like terms: 10 + -10 = 0
2 + 13x + 2x2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
1 + 6.5x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 6.5x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 6.5x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 6.5x + x2 = 0 + -1
6.5x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
6.5x + x2 = -1

The x term is 6.5x.  Take half its coefficient (3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
6.5x + 10.5625 + x2 = -1 + 10.5625

Reorder the terms:
10.5625 + 6.5x + x2 = -1 + 10.5625

Combine like terms: -1 + 10.5625 = 9.5625
10.5625 + 6.5x + x2 = 9.5625

Factor a perfect square on the left side:
(x + 3.25)(x + 3.25) = 9.5625

Calculate the square root of the right side: 3.092329219

Break this problem into two subproblems by setting 
(x + 3.25) equal to 3.092329219 and -3.092329219.

Subproblem 1
x + 3.25 = 3.092329219

Simplifying
x + 3.25 = 3.092329219

Reorder the terms:
3.25 + x = 3.092329219

Solving
3.25 + x = 3.092329219

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3.25' to each side of the equation.
3.25 + -3.25 + x = 3.092329219 + -3.25

Combine like terms: 3.25 + -3.25 = 0.00
0.00 + x = 3.092329219 + -3.25
x = 3.092329219 + -3.25

Combine like terms: 3.092329219 + -3.25 = -0.157670781
x = -0.157670781

Simplifying
x = -0.157670781

Subproblem 2
x + 3.25 = -3.092329219

Simplifying
x + 3.25 = -3.092329219

Reorder the terms:
3.25 + x = -3.092329219

Solving
3.25 + x = -3.092329219

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3.25' to each side of the equation.
3.25 + -3.25 + x = -3.092329219 + -3.25

Combine like terms: 3.25 + -3.25 = 0.00
0.00 + x = -3.092329219 + -3.25
x = -3.092329219 + -3.25

Combine like terms: -3.092329219 + -3.25 = -6.342329219
x = -6.342329219

Simplifying
x = -6.342329219

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {-0.157670781, -6.342329219}